以下有幾題化學問題希望化學高手幫忙解題!!感謝!!

1. Consider an atom traveling at 2% of the speed of light. The de Broglie wavelength is found to be 3.50 × 10–6 nm. Which element is this? (Planck’s constant, h = 6.626 × 10-34 J⋅s)
(A) O (16.00) (B) F (19.00) (C) S (32.06) (D) Ar (39.95)

不知道是不是用E=hv=1/2Mv^2的公式帶,但是頻率又不知道要帶什麼


以下三題完全沒概念@@

2. The autoionization of water, H2O(l) + H2O(l) H3O+ (aq) + OH– (aq), is known to be endothermic. Which of the following correctly states what occurs as the temperature of water is raised?
(A) The pH of the water does not change, and the water remains neutral.
(B) The pH of the water decreases, and the water becomes more acidic.
(C) The pH of the water increases and the water remains neutral.
(D) The pH of the water decreases, and the water remains neutral.


3. Which of the following result(s) in an increase in the entropy of the system? I.Br2(g) → Br2(l), II. NaBr(s) →Na+ (aq) + Br– (aq), III. O2(298 K) → O2(373 K), IV. NH3(1 atm, 298 K) → NH3(3 atm, 298 K)
(A) I, III (B) II, III (C) I, II, III (D) II, III, IV

4. For the reaction A + B  C + D, ∆H° = +40 kJ and ∆S° = +50 J/K. Therefore, the reaction under standard conditions is
(A) spontaneous at temperatures less than 10 K
(B) spontaneous at temperatures greater than 800 K
(C) spontaneous only at temperatures between 10 K and 800 K
(D) spontaneous at all temperatures

共 8 則回應

0
第一題應該是用德布洛依波長的公式喔
波長=h/(m*v)
其他我只是大概知道而已
怕有錯就不解答了
1
嘉義大學的啊~~
獸醫是我的
考前我就不幫你了
已經刪除的內容就像 Dcard 一樣,錯過是無法再相見的!
0
B1謝謝你
B2我不是報獸醫啦~一起加油吧!
0
這些題目都很經典
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B6 謝謝你!!你也是要考嘉大嗎?加油~
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B7 加油 我沒有要考
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